aboutsummaryrefslogtreecommitdiff
path: root/src/exchangedb/exchange_do_recoup_to_coin.sql
blob: 6cecfb7f89585ab9d4f385114ca0dc9fd2753ccd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
--
-- This file is part of TALER
-- Copyright (C) 2014--2022 Taler Systems SA
--
-- TALER is free software; you can redistribute it and/or modify it under the
-- terms of the GNU General Public License as published by the Free Software
-- Foundation; either version 3, or (at your option) any later version.
--
-- TALER is distributed in the hope that it will be useful, but WITHOUT ANY
-- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
-- A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License along with
-- TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
--




CREATE OR REPLACE FUNCTION exchange_do_recoup_to_coin(
  IN in_old_coin_pub BYTEA,
  IN in_rrc_serial INT8,
  IN in_coin_blind BYTEA,
  IN in_coin_pub BYTEA,
  IN in_known_coin_id INT8,
  IN in_coin_sig BYTEA,
  IN in_recoup_timestamp INT8,
  OUT out_recoup_ok BOOLEAN,
  OUT out_internal_failure BOOLEAN,
  OUT out_recoup_timestamp INT8)
LANGUAGE plpgsql
AS $$
DECLARE
  rval RECORD;
DECLARE
  tmp taler_amount; -- amount recouped
BEGIN

-- Shards: UPDATE known_coins (by coin_pub)
--         SELECT recoup_refresh (by coin_pub)
--         UPDATE known_coins (by coin_pub)
--         INSERT recoup_refresh (by coin_pub)

out_internal_failure=FALSE;

-- Check remaining balance of the coin.
SELECT
   remaining
 INTO
   rval
FROM exchange.known_coins
  WHERE coin_pub=in_coin_pub;

IF NOT FOUND
THEN
  out_internal_failure=TRUE;
  out_recoup_ok=FALSE;
  RETURN;
END IF;

tmp := rval.remaining;

IF tmp.val + tmp.frac = 0
THEN
  -- Check for idempotency
  SELECT
      recoup_timestamp
    INTO
      out_recoup_timestamp
    FROM recoup_refresh
    WHERE coin_pub=in_coin_pub;
  out_recoup_ok=FOUND;
  RETURN;
END IF;

-- Update balance of the coin.
UPDATE known_coins
  SET
     remaining.val = 0
    ,remaining.frac = 0
  WHERE coin_pub=in_coin_pub;

-- Credit the old coin.
UPDATE known_coins kc
  SET
    remaining.frac=(kc.remaining).frac+tmp.frac
       - CASE
         WHEN (kc.remaining).frac+tmp.frac >= 100000000
         THEN 100000000
         ELSE 0
         END,
    remaining.val=(kc.remaining).val+tmp.val
       + CASE
         WHEN (kc.remaining).frac+tmp.frac >= 100000000
         THEN 1
         ELSE 0
         END
  WHERE coin_pub=in_old_coin_pub;

IF NOT FOUND
THEN
  RAISE NOTICE 'failed to increase old coin balance from recoup';
  out_recoup_ok=TRUE;
  out_internal_failure=TRUE;
  RETURN;
END IF;


INSERT INTO recoup_refresh
  (coin_pub
  ,known_coin_id
  ,coin_sig
  ,coin_blind
  ,amount
  ,recoup_timestamp
  ,rrc_serial
  )
VALUES
  (in_coin_pub
  ,in_known_coin_id
  ,in_coin_sig
  ,in_coin_blind
  ,tmp
  ,in_recoup_timestamp
  ,in_rrc_serial);

-- Normal end, everything is fine.
out_recoup_ok=TRUE;
out_recoup_timestamp=in_recoup_timestamp;

END $$;


-- COMMENT ON FUNCTION exchange_do_recoup_to_coin(INT8, INT4, BYTEA, BOOLEAN, BOOLEAN)
--  IS 'Executes a recoup-refresh of a coin that was obtained from a refresh-reveal process';